Which one of the following sets correctly represents the increase in the paramagnetic property of the ion?
( a) Cu2+ < V2+ < Cr2+ < Mn2+
(b) Cu2+ < Cr2+ < V2+ < Mn2+
(c) Mn2+ < V2+ < Cr2+ < Cu2+
(d) Mn2+ < Cu2+ < Cr2+ < V2+
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(b), because copper is more reactive in reactivity series. and chromium is second more reative
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